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Finding the Fourth Proportional to 667.67, 1,001.37 and 256.87

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Solution

The fourth proportional to 667.67, 1,001.37 and 256.87 is: 385.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.67 : 1,001.37 = 256.87 : x
  2. Step 2: Convert to fraction form
    667.67/1,001.37 = 256.87/x
  3. Step 3: Cross multiply
    667.67x = 1,001.37 × 256.87
  4. Step 4: Simplify right side
    667.67x = 257,219.41
  5. Step 5: Solve for x
    x = 257,219.41/667.67
  6. Step 6: Final answer
    x = 385.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.